When the temperature of water is decreased and ice is formed then the molecules become more regular and this regularity extends throughout the whole structure. Empty spaces are left behind as shown in the figure below. That is why when water freezes it occupy 9% more space and its density decreases. The result is that…
Soaps and detergents perform the cleaning action because the polar parts of their molecules are water soluble due to hydrogen-bonding and non-polar parts remain outside water.
When we consider the hydrides of group VA, VIA, VIIA then NH3, HF and H2O show maximum boiling points in the respective series. The reason is the enhanced electronegative character of N, O and F. That is why, water is liquid at room temperature, but H2S and H2Se are gases. Comparatively high boiling points of…
In addition to water, ethyl alcohol (C2H5OH) also has the tendency to form hydrogen bonds. So, ethyl alcohol can dissolve in water because both can form hydrogen bonds with each other. Similarly, carboxylic acids are also soluble in water, if their sizes are small. Hydrocarbons being non-polar are not soluble in water at all, and…
The pressure of air that can support 760 mmHg column at sea level is called one atmosphere. OR It is a force exerted by 76 cm long column of mercury on an area of 1 cm2 at 0°C. Atmospheric Pressure at Sea Level: It is the average pressure of atmosphere at sea level. i.e.; 760…
The word chromatography originates from the Greek word ‘khromatos’ meaning color writing. Definition: A technique used for separating the components of a mixture by their distribution between a stationary and a mobile phase is called chromatography. Chromatography Principle: Chromatography is a method used primarily for the separation of a sample mixture and involves the distribution…